Hunter Reagan cools off in the fountains at a local water park Thursday, July 21, 2011, in Lafayette, Ind. The National Weather Service has issued an excessive heat warning for all of Greater Lafayette through 8 p.m. Saturday. High temperatures Friday and Saturday will top out around 100 degrees with heat index values around 115 in the late afternoon. (AP Photo/Journal & Courier, Michael Heinz) MANDATORY CREDIT; NO SALES